Abstract
The kinetics of oxygen uptake \((\dot V{O_2})\)adjustment to moderate intensity cycling exercise are slowed as a function of age (1,5). This implies that older individuals must rely on anaerobic systems, to a greater extent, to meet energy requirements during transitions to exercise, increasing the possibility of early fatigue. The purpose of this study was to compare \(\dot V{O_2}\) kinetics between old and young subjects during an exercise of a smaller muscle mass (ankle plantar flexion). Ankle plantar flexion was performed using an ergometer, developed to measure kinetics with 31P-nuclear magnetic resonance spectroscopy (NMRS), where phosphocreatine kinetics correspond to muscle respiratory kinetics (3,10,15). Since plantar flexor muscles of older individuals have decreased capillarization and oxidative enzyme activity (4,7) and a greater amount of “non-muscle” tissue than young (14), we expected to find a slow oxygen delivery, or oxygen utilization at the start of exercise. This would result in an impairment of \(\dot V{O_2}\) kinetics with age.
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Chilibeck, P.D., Paterson, D.H., Cunningham, D.A. (1995). Effects of Age on \( (\dot V{O_2}) \) Kinetics During Calf and Cycling Exercise. In: Semple, S.J.G., Adams, L., Whipp, B.J. (eds) Modeling and Control of Ventilation. Advances in Experimental Medicine and Biology, vol 393. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1933-1_37
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DOI: https://doi.org/10.1007/978-1-4615-1933-1_37
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